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Fault Hiding of Nonlinear Parameter Varying Systems
No full textInternational audienceThis letter addresses the problem of fault-tolerant control of nonlinear parameter-varying (N-LPV) systems. Specifically, it focuses on N-LPV models that effectively represent nonlinear systems by partially embedding nonlinearities while preserving sector-bounded terms. This representation simplifies control design by reducing the number of polytope vertices compared to traditional linear parameter-varying approaches. The main contribution of this letter is to present novel fault-hiding approaches for fault-tolerant control of N-LPV models. The proposed approach guarantees recovery of the asymptotic stability for N-LPV systems under multiplicative sensor and actuator faults using a generic static N-LPV structure. Moreover, it guarantees the input-to-state stability of the reconfigured system under additive faults
La jurisprudence contradictoire d'une Cour de cassation peut rendre imprévisible une privation de propriété
No full textInternational audience(CEDH 6 mai 2025, no 13959/20, Communauté juive de Thessalonique c/ Grèce
Do Micropower Sources Meet the Needs of the Internet of Things?
No full textInternational audienceAbstract The rapid global adoption of the Internet of Things (IoT), combined with the ongoing trend toward device miniaturization, has marked the emergence of compact, connected technologies. However, as device dimensions continue to decrease, power sources remain a critical bottleneck. Micropower sources (<1 cm 2 ) must balance the inherent trade‐off between physical size and achievable energy and power densities. Although advances in materials and design are steadily improving performance within small form factors, a comprehensive assessment of how well current micropower technologies meet the energy and power requirements of modern IoT devices is still lacking. This Perspective aims to: 1) define the opportunity space for miniaturized energy storage systems within IoT technologies, 2) survey the commercial and research landscape of micropower sources, and 3) critically evaluate whether current micropower solutions fulfill the demands of existing and emerging IoT applications
Harcèlement sexuel assimilé et pression : sans gravité, pas d'infraction, obs. Cass., crim., 7 mai 2025, n° 24-83.446, AJ pén. 2025, p. 408
No full textInternational audienc
Broadband surface acoustic wave attenuation in metals using chirp compression and dispersive interdigital transducers
No full textInternational audienceThis study presents a non-destructive method for estimating surface acoustic wave attenuation, which is highly sensitive to microstructural features, especially at high frequencies. The method uses a single wideband dispersive interdigital transducer (IDT) that remotely emits acoustic waves at the sample's edge. Chirp compression of the temporal displacement response is achieved by correlating the excitation signal with the spatial configuration of the IDT's electrodes. This technique generates high-amplitude pulses with a sufficient signal-to-noise ratio, critical for enabling accurate attenuation estimation over a frequency range (15-70 MHz). Results from nickel and aluminum demonstrate the method's effectiveness for rapid material characterization.</div
A multi-scale computational strategy for fast transient problems with a physics-guided neural-network local modeling
No full textInternational audienceA multi-scale computational strategy for fast transient problems with a physics-guided neural-network local modelin
Lamb waves nonlinear imaging of impact damages in laminate composite plates
No full textInternational audienceComposite materials are increasingly used in the aeronautics industry, as they are lighter than traditional materials for equivalent mechanical strength. However, they are subject to impacts, leading to damages sometimes very difficult to detect with traditional ultrasonic Structural Health Monitoring methods. In this paper, a baseline free method making use of a low frequency vibration combined with a high frequency guided waves imaging technique is tested for real impact damages on Carbon Fiber Reinforced Composite laminate plates typically used in aeronautics
IN-DEPTH COMPARATIVE STUDY OF MF-TDMA AND OTDM-WDM SYSTEMS: INNOVATIVE INSIGHTS FOR DVB-RCS2 NETWORKS
No full textInternational audienceThis paper examines the complex intricacies of access method design in new network architectures. A new approach to the multi-frequency time division multiple access (MF-TDMA) paradigm is the main objective of this study. Optical time-division multiplexing-optical wavelength-division multiplexing (OTDM-WDM) fusion, which is envisaged, motivates this research. In addition, this approach is examined through theoretical and practical analysis, including tiling representations, equations characterizing each system, capacity equations, as well as a comparative simulation of MF-TDMA versus OTDM-WDM via evaluation of the bit error rate (BER), signal-to-noise ratio (SNR), and the quality factor in the optical system. The emphasis is on continuous improvement, focusing on service conceptualization and modeling. Our strategy is to facilitate the integration of optical infrastructures into digital video broadcasting-return channel via satellite (DVB-RCS2) standards, in order to optimize the quality of service and respond effectively to the growing need for broadband connectivity
Electron beam lithography tests on EM Resist’s new 32%-HSQ resist formulation
No full textNational audienc
Engineering a microfluidic platform for cell extravasation monitoring and downstream characterization of disseminated cells
No full textInternational audienceMetastatic cancer cells and immune cells spread throughout the body via the bloodstream, reaching target sites for immune clearance or establishing secondary tumors in distant organs. As they move from blood circulation to a targeted organ, cells adhere to activated endothelium and then extravasate through it into a tissue-rich environment. The molecular mechanisms that drive the extravasation of immune and cancer cells are not yet fully understood. Most importantly, the phenotypic state identity of the disseminated cancer cells has yet to be characterized. While various sealed microfluidic devices have been developed to study extravasation, few, if any, allow for the efficient collection of extravasated cells. To address this limitation, we designed a biomimetic microfluidic device comprising a network of 3D blood capillaries and a customizable collecting chamber, separated by a porous membrane. Our device enables i) real-time monitoring of cell extravasation through the endothelium via live imaging and ii) the collection of disseminated cells for subsequent molecular characterization. We validated the functional properties of the 3D endothelial layer under shear stress and inflammation induction. After injecting promyeloblast cells and metastatic cancer cells into the lumen of the capillary network, we observed cell rolling and extravasation under continuous flow conditions. Finally, we collected extravasated cancer cells for gene expression profiling by RT-qPCR. Overall, our novel microfluidic device reconstitutes a functional 3D blood vessel network, allowing real-time observation of extravasation and the collection of disseminated cells for further characterization.</div